TLC2942_06 Datasheet, PDF (25/29 Pages) Texas Instruments – HIGH-PERFORMANCE DUAL PHASE-LOCKED LOOP BUILDING BLOCK

TLC2942
HIGH-PERFORMANCE DUAL PHASE-LOCKED LOOP BUILDING BLOCK
SLAS146B – NOVEMBER 1996 – REVISED JUNE 1997
APPLICATION INFORMATION
The evaluation and operation schematic for the TLC2942I is shown in Figure 28.
REF IN
VDD
PLL1
1
LOGIC VDD (digital)
2 SELECT
3 _{VCO OUT}
4 FIN – A
VCO
38
VCO VDD
1/2 fosc
37
BIAS
36
VCOIN
35
VCO GND
AVDD
R1†
0.22 µF
R3
C2
R2
C1
DGND
5 FIN – B
6 ^{PFD OUT}
Phase
Comparator
7
LOGIC GND (Digital)
VCOINHIBIT 34
PFD INHIBIT ₃₃
8
GND
AGND
Divide
By
N
DGND
PLL2
S1
S2
S3
R4 R5 R6
DGND
DVDD
† _{RBIAS resistor}
Figure 28. Evaluation and Operation Schematic
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